This kind of animal is able to protect itself from danger in many years. ________, the colouring of its hide makes it almost invisible when it is feeding in the shadow of trees.

A．First at all

B．First of all

C．In all

D．At all

下列不属于成分输血的是（）。

A.预存式自体输血

B.输注血小板

C.输注红细胞

D.输注FFP

E.输注冷沉淀